Currently Being ModeratedOct 25, 2012 10:23 AM (in response to Navigator 19)
Battery is an integral part of the power system.
A non-functioning battery can cause problems including slowing down the computer.
Graphic intensive applications draw additional power from the battery.
"Service Battery" means replace the battery as soon as possible.
"Replace Now" means replace the battery now.
Currently Being ModeratedOct 25, 2012 10:47 AM (in response to Navigator 19)
16 months? Wow, I hope you bought AppleCare.
Go to your Apple menu > About this Mac > More Information > Power > Battery and copy all the information and paste it here.
I have a Early 2011 machine too. Thanks
Currently Being ModeratedOct 25, 2012 11:16 AM (in response to Navigator 19)
Yep, processor speed is automatically reduced. Your situation is the same as if you didn't have a battery installed Read here:
Currently Being ModeratedMar 20, 2013 6:25 PM (in response to wjosten)
I'm having the same issue. Early 2011 Macbook Pro, 8GB RAM, about two years, pretty intensive use of battery. Couple of weeks ago, the status was 'check battery', but after I updated the SMC firmware, the status changed to 'replace now'. So now my mac gets really slow after a few minutes of use. It startsup ok, but later on, even when typing an adress in Safari takes a while to the charecters appear after I hit the keybord, and the video playback is terrible. This is very annoying. I will absolutely have to replace my 248 cycle dead battery much sooner than what I'd expect.
Currently Being ModeratedJul 2, 2013 7:04 PM (in response to Navigator 19)
No guarantees but this worked for me:
My Mac started running really slow when my battery died. I have a MBP (early 2011) with a built-in battery.
I checked Activity Monitor (/Applications/Utilities/Activity Monitor) and found that PID O, kernel task, was taking up 500% of CPU. Normally, it's < 5% at all times. I searched online and found the following fix. Though my battery was still dead, performing this fix solved my problem. Speed improved to normal. I still had to get my battery replaced but now my MBP is completely okay. I would check Activity Monitor. If PID 0 is taking up a lot of CPU %, you may want to try this.
BTW, the fix removes a .plist related to SMC thermal control. I don't know why it works but it worked for me. It looks a little scary to do but I had no problems and it worked instantly.
Here's the link: http://www.rdoxenham.com/?p=259
Don't follow the advice in the main text. Follow the advice in the comments, by "bryazana:"
1. Go to About this mac under the apple in the upper left and click on More info
2. Click on system report
3. make a note of what it says after Model Identifier
4. go to your master drive – System -Library – Extensions – IOPlatformPluginFamily.kext -Contents – Plugins – ACPI_SMC_PlatformPlugin.kext – Contents – Resources – find the name from step 3 and move it to a folder that you can find again if needed.
3. Restart and you’re done
I hope this helps.
Currently Being ModeratedNov 24, 2013 7:47 PM (in response to Dhalgren)
Thanks it was really helpfull, now mi mb is running great but is getting hot .. Any suggestions?
Currently Being ModeratedMar 14, 2014 3:07 PM (in response to Dhalgren)
I almost gave up after trying different things SMC and NVRAM reset multiple times, erased my HDD and reinstalled OS twice. Dhalgrensolution seems to work for me and i dont face the lagging performance issues anymore.
Thanks a bunch!